Source : Webster's Revised Unabridged Dictionary (1913)

Forego \Fore*go"\, v. t. [imp. {Forewent 2}; p. p. {Foregone}
   (?; 115); p. pr. & vb. n. {Foregoing}.] [See {Forgo}.]
   1. To quit; to relinquish; to leave.

            Stay at the third cup, or forego the place.
                                                  --Herbert.

   2. To relinquish the enjoyment or advantage of; to give up;
      to resign; to renounce; -- said of a thing already
      enjoyed, or of one within reach, or anticipated.

            All my patrimony,, If need be, I am ready to forego.
                                                  --Milton.

            Thy lovers must their promised heaven forego.
                                                  --Keble.

            [He] never forewent an opportunity of honest profit.
                                                  --R. L.
                                                  Stevenson.

   Note: Forgo is the better spelling etymologically, but the
         word has been confused with {Forego}, to go before.

Forego \Fore*go"\, v. t. [AS. foreg[=a]n; fore + g[=a]n to go;
   akin to G. vorgehen to go before, precede. See {GO}, v. i.]
   To go before; to precede; -- used especially in the present
   and past participles.

         Pleasing remembrance of a thought foregone.
                                                  --Wordsworth.

         For which the very mother's face forewent The mother's
         special patience.                        --Mrs.
                                                  Browning.

   {Foregone conclusion}, one which has preceded argument or
      examination; one predetermined.

Source : WordNet®

forego
     v : be earlier in time; go back further; "Stone tools precede
         bronze tools" [syn: {predate}, {precede}, {antecede}, {antedate}]
         [ant: {postdate}]
     [also: {forewent}, {foregone}]